Printing-press.



L. BAKKE.

PRINTING PRESS.

APPLICATION IILBD 38.19, 1914.

1,096,590, Patented May12,1914.

2 SHEETS-{MEET 1.

COLUMBIA PLANOGRAIH C0,,WASHIN ooooooo c.

L. BAKKE.

PRINTING PRESS.

APPLIGATION FILED r1112. 19, 1914.

1,096,590. Patented May 12,1914,

2 SHEETS-43313131 2.

COL MBIA PLANOORAPII -co., WASHINGTON. 04

' is a longitudinal vertical section through the the frame lO. An eccentric pin 15 on the LEOPOLD BAKKE, OF CHICAGO, ILLINOIS.

PRINTING-PRESS.

Specification of Letters Patent.

Patented May 12, 1914.

Application filed February 19, 1914. Serial No. 819,665.

To all whom it may concern Be it known that I, LEOPOLD BAKKE, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Printing-Presses, of which the following is a full, clear, and exact specification.

My invention is concerned with improvements in printing presses ofthc Gordon type, shown in my application No. 798,630, filed November 1, 1913, and allowed January 31, 191 1, the patent for which I expect to have issued simultaneously herewith, and in which yielding link connections be tween the swinging type-bed frame and the swinging platen are substituted for the cus tomary cam connections ordinarily used for swinging the latter. In my aforesaid application No. 798,630, the press is not provided with a throw-off, and in my present application, I show the same invention as applied to such a Gordon press having a throwoif, the presence of which in the press necessitates the modification of the structure shown in my aforesaid application in the manner hereinafter described.

To illustrate my invention, I annex hereto two sheets of drawings, in which the same reference characters are used to designate identical parts in all the figures, of which- Figure 1 is a perspective View of the rear of a press embodying my invention, this particular view being designed more especially to illustrate the throw-off connections; Fig. 2 is a side elevation seen from the side on which the yielding link is located; Fig. 3 is a detail section showing part of the train of connections leading from the throw off lever to the eccentric shaft, the rocking of which operates the throw-oil; Fig. 1

yielding link; Fig. 5 is a detail in horizontal section on an enlarged scale, on the line A-A of Fig. 2; and Fig. 6 is a detail in section on the lineBB of Fig. 5.

The customary type of Gordon press employs the stationary main-frame 10, in which ismounted the drive shaft 11, rotated by any suitable source of power,as by means of belts associated with the belt-wheels 11 mounted on said shaft 11 in the customary manner. This shaft 11 carries a spur-gear pinion 12 meshing with a spur-gear wheel 13 .secured on a shaft 141, also journaled in spur-gear wheel has pivoted thereon a link it], which is pivotally connected to the reduced bearing end 17 of the eccentric shaft 18 jOlll'l'ltllQtl in the bed-plate frame 19,

which has arms 20 extending down toward the bottom of the frame and pivotally mounted thereon on a shaft 21. It will be understood that the crank pin 15, link 16, reduced bearing end 17, and the arm 20, are duplicated on the other side of the machine to give it symmetry and properly support the parts. The bed-plate frame 19 carries the customary type-bed at 22, and it will be obvious that the rotation of the shaft 14; tends to brin the bcd-plate first to printing position, antf then to retract the same for the inking operation, which is effected by the customary inking rollers carried in the customary swinging inking-frame, the side pieces of which I have numbered 23, and which slide back and forth on the eccentric shaft 18 in. the customary manner.

J ournaled in the frame 10 is a rock shaft i l, which has secured thereon the platen 25, which is swung up to the position shown in full lines in Fig. 2, where it is adapted to have the paper to be )rinted placed thereon by hand during the time that the bed plate is retracted for inking the type. hen an impression is taken, it is obvious that the rock shaft must be rocked to the dottedline position, and the frame 19 similarly swung to its dotted-line position to make an impression, and my present invention is concerned with the connections by which the movement of the rock shaft 24 is effected in y 29, which tendsto hold the reduced end 30 of the outer portion 31 in the position shown in Figs. 2 and 1, in which position the pin 33') secured in the tube 28, and passed through a slot 32) in said reduced end 30, is in its outermost position in said slot. The outer portion 31 is also provided with a helicallycoiled expanding spring 34 mounted therein and adapted to have its tension increased or diminished by a set screw 35 threaded through a nut 36 secured in the outer end of the portion 31, and cotiperating with a plug 37, against which the end of the spring 3st rests. The inner end of the portion 31 preferably takes the shape of an open guideslot 38, in which a block 39 is adapted to reciprocate, said block being preferably provided with a pin 10 extending into the end of the coil. of the spring 3%. The block 39 is held by a pivot pin .21 in its position on the inner side of a lever 4-2 pivoted at its lower end on the shaft 21, and secured at its upper end in the manner to be hereinafter described.

In the structure shown in my aforesaid application, No. 798,630, the pin 41 is secured on a bracket extending from the side of the frame 19, to which it is rigidly connected. Assuming, for the purposes of the preliminary description, that the lever 42, to

which the pin 41. is connected, is rigid with the bed-plate frame 19, the operation of the novel movement, as shown in. my aforesaid application and in the present application, is as follows: assuming that the parts are in the position in which the bed-plate frame 19 is retracted as far as possible from the platen,-in this position, the block 39 occupies the outer portion of the guide-slot 38, and the spring 34 is compressed. As a result of the operation of this spring, when the bed-plate frame 19 begins to swing from its outermost position toward the platen, the link 27 is held from movement until the bedplate frame 19 has swung inward far enough so that the block 39 can move to the inner end of the slot 38 under the pressure of the spring 34.. This holding the link 27 from movement for this interval increases the length of time in which the platen is held in the feeding posit-ion, so that the operator has that much more time to place the paper carefully on the platen. At the end of this movement of the block 39 in the slot 38, the further inward movement of the bed-plate frame 19 moves the link 27 inward, and as it moves, it rocks the shaft 2-4, bringing it ultimately down to the printing position, and when it reaches this position, the spring 29 is still expanded, with the pin 32 at the outer end of the slot The taking of the impression necessitates a further inward movement of the bed-plate frame, and as the crank arm 23 and the portion 28 of the link cannot move any farther, the outer portion 31 of the link 16 continues its movement by reason of the reduced end 30 passing farther into the portion 18, compressing the spring 29 as much as be necessary to secure the desired sharpness of impression. At the end of this inward movement, the link 16, of course, begins to move outward, and this carries the bed-plate frame 19 outward. WVhen this outward movement starts, the spring '29 expands until the pin 32 rests in the outer end of the slot 33, after which the link 27 moves as av whole, and the shaft the spring 34, as previously mentioned.

The descriptionof the press and its construction so far would be applicable to the press shown in my application No. 798,630, which is not provided with a throw-off, exceptthat, as previously stated, the pin 1-1 is secured on a bracket rigidly secured on the side of the bed-plate frame 19, and the shaft 18 need not be an eccentric shaft. Where the throw-off is employed, the shaft 18 is rocked in its bearings by mechanism to be described, and as a result of the rocking of said shaft in the proper direction to put the throw-off in action, the reduced end 17 has no motion of translation in its bearing in the endof the link 16, and, as a consequence, the upper portion of the bedplate frame 19 is swung back a distance that would be determined by the eccentricity of the shaft 18 and the angle through which it is swung. When it is thus swungback, as the press continues to operate, the type are not brought into engagement with the platen as the parts approach each other. The rocking of this shaft 18 may be effected in various ways, and I have shown the customary construction, in which the throw-off handlever 43 is pivoted to a bracket ist secured on the frame 10, and has a link 45 secured at its lower end, connected to an arm 46 on a rock shaft 47, which is journaled in the frame 10. This rock shaft 47 carries the throw-off pin-circle lever 48, which has a pin 49 engaging a slot 50 in the arm 51 of a lever 52, secured on a rock shaft 53, the other arm 54 of which lever is connected by a link 55 with an arm 56 of the throw-off saddle 57 secured on the eccentric shaft 18. With the connections thus shown, as the lever 43 is swung forward or back, the eccentric shaft 18 will be rocked to operate the throw-off in the customary manner. If the pin ll is connected to a part rigid with the bed-plate frame 19, as in the structure shown in my aforesaid application No. 798,630, the press will operate all right while the throw off is not in operation, but when the throwoff lever has been shifted to throw the bedplate frame 19 back far enough so that the type-bed will not engage the platen at the end of the impression swing, the tendency is to rock the platen 25 too far, and thus tend Cir to rack the machine and make a noisy operation. To overcome this difiiculty, I have secured the pin 4:1, as before described, on the inner face of the lever 42, and the upper end of said lever 42 is pivotally connected to an eccentric strap 58, which preferably has anti-friction rollers 59 interposed between the strap 58 and a disk 60, which is mounted eccentrically on the end of the eccentric shaft 18, but which is concentric with the reduced bearing end 17 of said shaft. Consequently the lever 42 does not swing with the bed-plate frame 19 when the throw-off mechanism is operated, and therefore the link 27 moves the platen :25 only the proper distance, whether the throw-off mechanism is or is not in operation.

IVhile I have shown and described my invention as embodied in the form which I at resent consider best adapted to carry out its purposes, it will be understood that it is capable of modifications, and that I do not desire to be limited in the interpretation of the following claims except as may be necessitated by the state of the prior art.

\Vhat I claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a press, the combination with a frame, of a driving shaft jonrnaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and bed-plate for swinging the latter to and from the platen, once for each rotation of the shaft, throw-oft mechanism for varying the position of thebed-plate relative to the frame, a crank-arm connected to the platen, a yielding link connecting the crank-arm and the bed-plate, means for preventing the movement of the crank-arm during the inward portion of the movement of the bed-plate until the latter reaches a certain position, and a member moving with the bed-plate to which the link is connected, said member being unaffected by the operation of the throw-off mechanism. 4

2. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections bet-ween the shaft and bed-plate for swing-- ing the latter to and from the platen, once for each rotation of the shaft, throw-off mechanism for varying the position of the bed-plate relative to the frame, a crank-arm connected to the platen, a yielding link connecting the crank-arm and the bed-plate, means for preventing the movement of the crank-arm during the inward portion of the movement of the bed-plate until the latter reaches a certain position, said means consisting of a spring that is compressed during the final portion of the outward movement of the bed-plate, and whose expansion during the first portion of its inward movement prevents the movement of the link until the spring has expanded, and a member moving with the bed-plate to which the link is connected, said member being unaffected by the operation of the throw-oil mechanism.

3. In a press, the combination with a frame, of a drivin shaft journaled therein, a swinging be -plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank-arm connected to the platen, a yielding link connecting the crank-arm and bedplate, and including two springs, one of which is compressed during the final portion of the outward movement of the bed plate, and whose expansion during the first portion of the inward movement prevents the movement of the link until said spring has expanded, and the other one of which is compressed effectively to shorten the link at the time the impression is actually taken, throw-off mechanism for varying the position of the bed-plate relative to the frame, and a member moving with the bed-plate to which the link is connected, said member being unaffected by the operation of the throw-off mechanism.

l. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank-arm connected to the platen, a twopart link connecting the crank-arm and the bed-plate and having telescoping connections, a spring in said link tending to keep it extended, throw-off mechanism for varying the position of the bed-plate relative to the frame, and a member moving with the bed-plate, to which the link is connected, said member bein unaffected by the operation of the throw-01f mechanism.

5. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank-arm connected to the platen, a twopart link connecting the crank-arm and the bed-plate and having telescoping connections, a spring in said link tending to keep it extended, a second spring carried by the link and compressed by the connection of the bed-plate with the link at the end of the outward movement of the bed-plate to in crease the effective length of the link, throwo'tl' mechanism for varying the position of the bed-plate relative to the frame, and a member moving with the bed-plate, to which the link is connected, said member being unaffected by the operation of the throw-off mechanism.

6. In a press, the combination with a frame, of a driving shaft journaled therein, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, connections between the shaft and the bed-plate for swinging the latter toward and from the platen, once for each rotation of the shaft, a crank-arm connected to the platen, a link connecting the crank-arm and the bed-plate, and comprising a tubular inner portion having a helically-coiled expanding spring therein, and an outer portion having its inner end telescoping in the outer end of the inner portion, and having a recess therein adjacent its inner end, a helically-coiled expand-ing spring in said outer portion. beyond the recess, a block sliding in a recess in said outer portion, thrown-off mechanism for varying the position of the bedplate relative to the frame, and a member moving with the bed-plate, upon which the block is pivoted, said member being unaffected by the operation of the throw-off mechanism.

7. In a press, the combination with a main frame, of a driving shaft ournaled therein, crank-pins carried by said shaft, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, an eccentric shaft in the bed-plate, links connecting the ends of the eccentric shaft and the crank-pins, throw-off mechanism for rocking the eccentric shaft to vary the position of the bedplate relative to the frame, a crank-ar1n con nected to the platen, a yielding link connected at one end to the crank-arm, a lever having the same fulcrum as the bed-plate, the other end of the link being connected to said lever, and connections between said lever and the eccentric shaft, said connections being unaffected by the rocking of said eccentric shaft.

8. In a press, the combination with a main frame, of a driving shaft journaled therein,

crank-pins carried by said shaft, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, an eccentric shaft in the bed-plate, links connecting the ends of the eccentric shaft and the crank-pins, throw-off mechanism for rocking the eccentric shaft to vary the position of the bedplate relative to the frame, a crank-arm connected to the platen, a yielding link connected to one end of the crank-arm, a lever having the same fulcrum as the bed-plate, the other end of the link being connected to said lever, an eccentric strap pivotally connected to the upper end of said lever, and an eccentric disk in said eccentric strap secured on the eccentric shaft concentric with the bearings for the links connecting the eccentric shaft and the crank-pins.

9. In a press, the combination with a main frame, of a driving shaft j ournaled therein, crank-pins carried by said shaft, a swinging bed-plate pivoted on the frame, a platen pivoted on the frame, an eccentric shaft in the bed-plate, links connecting the ends of the eccentric shaft and the crank-pins, throw-off mechanism for rocking the eccentric shaft to vary the position of the bedplate relative to the frame, a crank-arm connected to the platen, a yielding link connected at one end to the crank-arm, a lever having the same fulcrum as the bed-plate, the other end of the link being connected to said lever, an eccentric strap pivotally con.- nected to the upper end of said lever, an eccentric disk in said eccentric strap secured on the eccentric shaft concentric with the bearingsfor the links connecting the eccentric shaft and the crank-pins, and roller bearings interposed between said eccentric strap and its eccentric disk. 7

In witness whereof, I have hereunto set my hand and affixed my seal, this 12th day of February, A. D. 1914:.

LEOPOLD BAKKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

